Subject: Re: [Healeys] Diff oil

From: Harold Manifold via Healeys <[email-masked]>
Date: Sun, 1 Aug 2021 09:13:17 -0700

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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72" style=3D=
'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>Tom,<=
/p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>I use 80W=
-90 GL-5. Synthetic or non-synthetic is not really an issue but synthetic t=
ends to leak more.</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3D=
MsoNormal>Harold<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><d=
iv style=3D'mso-element:para-border-div;border:none;border-top:solid #E1E1E=
1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D'border:non=
e;padding:0in'><b>From: </b><a href=3D"mailto:[email-masked]">Tom F=
elts via Healeys</a><br><b>Sent: </b>Sunday, August 1, 2021 8:40 AM<br><b>T=
o: </b><a href=3D"mailto:[email-masked]">healeys</a><br><b>Subject:=
 </b>[Healeys] Diff oil</p></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p>=
<div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Aria=
l",sans-serif;color:black'>BJ8-----I'm changing oil inn the diff and had so=
me synthetic 75-140.&nbsp; Is that OK to use there?<o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"=
Arial",sans-serif;color:black'><o:p>&nbsp;</o:p></span></p></div><p class=
=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Arial",sans-serif=
;color:black'>thanks'tom<o:p></o:p></span></p><p class=3DMsoNormal><o:p>&nb=
sp;</o:p></p></div></body></html>=

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From: Michael Oritt via Healeys <[email-masked]>
Date: Sun, 1 Aug 2021 12:24:08 -0400

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Tom--

Its base--synthetic or dino--does not matter though I prefer the former.
However its GL rating DOES matter, and you should be using a diff lube with
a GL5 rating which will better stand up to the shearing forces in the
differential.  Engine oils or /GL4 transmission oils are not sufficient.

On Sun, Aug 1, 2021 at 11:40 AM Tom Felts via Healeys <
[email-masked]> wrote:

> BJ8-----I'm changing oil inn the diff and had some synthetic 75-140.  Is
> that OK to use there?
>
> thanks'tom
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-- 
Best--Michael

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Tom--=
</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div c=
lass=3D"gmail_default" style=3D"color:#3333ff">Its base--synthetic=C2=A0or=
=C2=A0dino--does not matter though I prefer the former.=C2=A0 However its G=
L rating DOES matter, and you should be using a diff lube with a GL5 rating=
 which will=C2=A0better stand up to the shearing forces in the differential=
.=C2=A0 Engine oils or /GL4 transmission oils are not sufficient.</div></di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On S=
un, Aug 1, 2021 at 11:40 AM Tom Felts via Healeys &lt;<a href=3D"mailto:hea=
[email-masked]">[email-masked]</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><div><div>BJ8-----I&#39;m changi=
ng oil inn the diff and had some synthetic 75-140.=C2=A0 Is that OK to use =
there?</div><div><br></div><div>thanks&#39;tom</div></div>_________________=
______________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
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Archive: <a href=3D"http://www.team.net/pipermail/healeys" rel=3D"noreferre=
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<br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><font color=3D"#3333ff">Best--Michael</font></di=
v>

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From: Bob Spidell <[email-masked]>
Date: Sun, 1 Aug 2021 18:36:46 -0700

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It won't hurt anything; remember the diff oil lubes the rear hub 
bearings and they'll probably like it. The downside is it might add a 
thousandth of a second to your quarter-mile time.

On 8/1/2021 8:39 AM, Tom Felts via Healeys wrote:
> BJ8-----I'm changing oil inn the diff and had some synthetic 75-140.  
> Is that OK to use there?
>
> thanks'tom
>

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    It won't hurt anything; remember the diff oil lubes the rear hub
    bearings and they'll probably like it. The downside is it might add
    a thousandth of a second to your quarter-mile time.<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 8/1/2021 8:39 AM, Tom Felts via
      Healeys wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
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      <div>BJ8-----I'm changing oil inn the diff and had some synthetic
        75-140.  Is that OK to use there?</div>
      <div><br data-mce-bogus="1">
      </div>
      <div>thanks'tom</div>
      <br>
    </blockquote>
    <br>
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[email-masked]

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From: Bob Spidell <[email-masked]>
Date: Sun, 1 Aug 2021 18:47:39 -0700

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There's some debate that the EP--'Extreme Pressure' sulfur 
compounds*--additives used in GL-5 are not suitable for gearboxes with 
brass or bronze components. But, at most they may turn these copper 
alloys blackish and I've never heard of any issues in Healeys. I've used 
MT-90, which is GL-4 with somewhat less EP additives, in both my Healey 
gearboxes for years, and when I tore down the BJ8's gearbox the brass 
components were pristine. I use Redline 75W-110 GL-5 in the BJ8's diff 
with no issues.

Sniff some GL-5 sometime, and see if it doesn't smell a bit of brimstone.

bs

On 8/1/2021 9:24 AM, Michael Oritt via Healeys wrote:
> Tom--
>
> Its base--synthetic or dino--does not matter though I prefer the 
> former.  However its GL rating DOES matter, and you should be using a 
> diff lube with a GL5 rating which will better stand up to the shearing 
> forces in the differential.  Engine oils or /GL4 transmission oils are 
> not sufficient.
>
> On Sun, Aug 1, 2021 at 11:40 AM Tom Felts via Healeys 
>
>     BJ8-----I'm changing oil inn the diff and had some synthetic
>     75-140.  Is that OK to use there?
>
>     thanks'tom
>

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    There's some debate that the EP--'Extreme Pressure' sulfur
    compounds*--additives used in GL-5 are not suitable for gearboxes
    with brass or bronze components. But, at most they may turn these
    copper alloys blackish and I've never heard of any issues in
    Healeys. I've used MT-90, which is GL-4 with somewhat less EP
    additives, in both my Healey gearboxes for years, and when I tore
    down the BJ8's gearbox the brass components were pristine. I use
    Redline 75W-110 GL-5 in the BJ8's diff with no issues.<br>
    <br>
    Sniff some GL-5 sometime, and see if it doesn't smell a bit of
    brimstone.<br>
    <br>
    bs<br>
    <br>
    <div class="moz-cite-prefix">On 8/1/2021 9:24 AM, Michael Oritt via
      Healeys wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default" style="color:#3333ff">Tom--</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
        <div class="gmail_default" style="color:#3333ff">Its
          base--synthetic or dino--does not matter though I prefer the
          former.  However its GL rating DOES matter, and you should be
          using a diff lube with a GL5 rating which will better stand up
          to the shearing forces in the differential.  Engine oils or
          /GL4 transmission oils are not sufficient.</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Sun, Aug 1, 2021 at 11:40
          AM Tom Felts via Healeys &lt;<a
            href="mailto:[email-masked]" moz-do-not-send="true">[email-masked]</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
          <div>
            <div>BJ8-----I'm changing oil inn the diff and had some
              synthetic 75-140.  Is that OK to use there?</div>
            <div><br>
            </div>
            <div>thanks'tom</div>
          </div>
          <br>
        </blockquote>
      </div>
    </blockquote>
    <br>
  </body>
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[email-masked]

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